Carrington Mortgage Mortgage Complaint

Carrington Mortgage Mortgage department,

FHA mortgage Loan servicing, payments, escrow account Minnesota

Received letter from Carrington Mortgage Services stating repo and that owed 2 payments. Had mailed 1 payment that week and found out that the extra sent prior was held as it was not a full payment. I understand that. So, I overnighted the balance on Monday and it was tracked to delivery on Tuesday. Waiting until Friday to check if posted and found that neither were. Called them and they said they had received neither the check mailed a week earlier or the overnight. They stated that I would have to prove that anything was sent. I stated the tracking stated it was received. Now a week after still neither have been posted. I used the address on the letter for overnight, and the payment mailed was sent it their envelope with their address. What can I do to get a straight answer from them? Their customer service is totally lost. I know the payments are my fault, but goodness how do I fix if they are n't posting and receiving payments. I want to get this up to date asap. What can I do? I am afraid to double the payments as they may then deposit and post the old and new monies.